diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
new file mode 100644
index 0000000..0f3ea0b
--- /dev/null
+++ b/.github/workflows/ci.yml
@@ -0,0 +1,29 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+jobs:
+  test:
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest, macos-latest]
+    runs-on: ${{ matrix.os }}
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install dependencies (macOS)
+        if: runner.os == 'macOS'
+        run: brew install bats-core fzf
+
+      - name: Install dependencies (Linux)
+        if: runner.os == 'Linux'
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y bats fzf
+
+      - name: Run tests
+        run: bats tests
diff --git a/tests/create_worktree.bats b/tests/create_worktree.bats
index 9ff699f..634a05f 100644
--- a/tests/create_worktree.bats
+++ b/tests/create_worktree.bats
@@ -27,13 +27,13 @@ teardown() {
 
   run create_worktree "existing-dir"
   [ "$status" -eq 0 ]
-  [ "${lines[-1]}" = "$WT_BASE_DIR/existing-dir" ]
+  [ "${lines[${#lines[@]}-1]}" = "$WT_BASE_DIR/existing-dir" ]
 }
 
 @test "create_worktree creates a new branch and worktree if branch does not exist" {
   run create_worktree "new-feature"
   [ "$status" -eq 0 ]
-  [ "${lines[-1]}" = "$WT_BASE_DIR/new-feature" ]
+  [ "${lines[${#lines[@]}-1]}" = "$WT_BASE_DIR/new-feature" ]
 
   # Verify side effects
   [ -d "$WT_BASE_DIR/new-feature" ]
@@ -52,7 +52,7 @@ teardown() {
 
   run create_worktree "existing-branch"
   [ "$status" -eq 0 ]
-  [ "${lines[-1]}" = "$WT_BASE_DIR/existing-branch" ]
+  [ "${lines[${#lines[@]}-1]}" = "$WT_BASE_DIR/existing-branch" ]
 
   # Verify side effects
   [ -d "$WT_BASE_DIR/existing-branch" ]
@@ -72,7 +72,7 @@ teardown() {
 
   run create_worktree "feature-from-base" "base-branch"
   [ "$status" -eq 0 ]
-  [ "${lines[-1]}" = "$WT_BASE_DIR/feature-from-base" ]
+  [ "${lines[${#lines[@]}-1]}" = "$WT_BASE_DIR/feature-from-base" ]
 
   # Verify side effects
   [ -d "$WT_BASE_DIR/feature-from-base" ]
diff --git a/tests/pick_worktree.bats b/tests/pick_worktree.bats
index 51c827d..803192e 100644
--- a/tests/pick_worktree.bats
+++ b/tests/pick_worktree.bats
@@ -9,6 +9,7 @@ setup() {
     echo -e "feature\t/tmp/feature"
   }
   fzf() {
+    cat > /dev/null
     return 1 # Simulate user pressing Esc
   }
   export -f list_worktrees fzf